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在吐温80存在下.在 pH9.2～9.8时,Ag(Ⅰ)与隔试剂 A 生成水溶性的红色络合物,最大吸收波长为525nm,表观摩尔吸光系数为ε_(525)=8.6×10~4.络合物瞬时发色,30分钟内吸光度稳定不变.当银含量在0～15微克/50毫升时符合比尔定律.Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)、Cd(Ⅱ)、Hg(Ⅱ)等离子干扰测定.我们用氨三乙酸掩蔽 Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)、Cd(Ⅱ)等离子的干扰,可以不经分离,直接光度法测定废水中的微量银.应用于照相定影液废水中的微量银的测定,结果满意.对10微克/50毫升银的回收率均在95～105%以内。本文均较文献[1,2]灵敏。
In the presence of Tween 80. At pH 9.2 ~ 9.8, Ag (Ⅰ) and spacer A generated water-soluble red complexes, the maximum absorption wavelength of 525nm, the apparent molar absorptivity ε_ (525) = 8.6 × 10 ~ 4. The complex was transiently colored and its absorbance was stable within 30 minutes. Beer ’s law was obeyed when the silver content was between 0 and 15 μg / (Ⅱ), Ni (Ⅱ), Cu (Ⅱ), Zn (Ⅱ) and Cd (Ⅱ) were masked by nitrilotriacetic acid , Can be used to determine trace silver in waste water by direct spectrophotometry without separation.The results were satisfactory.The recoveries of 10 μg / 50 ml silver were 95 ~ 105% Within. This article are more sensitive than the literature [1,2].